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Rapid EV Chargers: Implementation of a Charger

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Rapid EV Chargers: Implementation of a Charger Rapid EV Chargers: Implementation of a Charger Ben Jar* 1, Neville Watson2, Allan Miller1 1 Electric Power Engineering Centre (EPECentre), University of Canterbury 2 Department of Electrical and Computer Engineering, University of Canterbury *Presenting EEA Conference & Exhibition 2016, 22 - 24 June, Wellington Abstract The uptake of electric vehicles in New Zealand is rapidly increasing and there is a desire for information about charging systems. This information is required by consumers, engineers, and businesses interested in installing charging infrastructure. This project was completed during the 2015-2016 summer break and aimed to enhance the University of Canterbury EPECentre’s knowledge of charging technologies. In addition to gaining a general understanding of charging technologies, detailed research into rapid DC chargers using the CHAdeMO protocol was conducted. The project also included the building and testing of an open source 12kW rapid DC charger using the CHAdeMO protocol. This paper combines the findings of researching the numerous charging technologies with the practical experience of building the charger. Although the charger was not tested with a compatible car due to time constraints, it was successfully built and initial testing was completed. Plans are also underway to conduct more comprehensive testing on the charger to fully characterise it. 1 1 Introduction During the university summer break of 2015-2016 a summer scholarship was awarded to the author to work on an open source rapid electric charger (EV). The primary purpose of this project was to gain an understanding of rapid EV charging systems; in particular, chargers using the CHAdeMO protocol. The University of Canterbury wanted to gain further understanding of the technology used in these chargers for research and teaching purposes. The eventual aim is to research how to use the chargers to allow bidirectional power flow for vehicle-to-grid (V2G) applications. A practical component of the project was required with the build and test of an open source charger. As of March 31st 2016, there are 1128 light EVs registered in New Zealand with this number rapidly increasing [1]. As EVs become more mainstream within New Zealand, the demand for charging technologies will substantially increase. This includes both residential systems and commercial public chargers. In particular, there will be a demand for rapid charging stations where consumers will be able to recharge their vehicles to approximately 80% in as little as 30 minutes. This will help reduce ‘range anxiety’ and further encourage consumers to use their EVs for longer journeys. To encourage the uptake of these technologies, stakeholders including consumers, investors, engineers, and electricity companies will need reliable information. Although there is plenty of information available, it is challenging to combine numerous sources and determine how it relates to the New Zealand market. As part the summer project, significant research into EV charger technology with an emphasis on CHAdeMO chargers was completed. This paper combines the research into EV charging technologies with the experiences of building the open source CHAdeMO charger to provide a source of information for anyone interested this rapidly changing field. 2 Electric Vehicle Charging Technologies The field of electric vehicle (EV) charging systems is rapidly evolving with numerous standards, types, connectors, and terms used to describe chargers. The generic term used to describe the piece of equipment used to charge an electric vehicle is ‘electric vehicle supply equipment’ (EVSE). EVSE can be further categorised into three levels that relate to their output power capabilities [2]. Level 1 and level 2 EVSE both supply alternating current (AC) to an electric vehicle’s on-board charger and level 3 systems supply direct current (DC) to the EV [2]. The use of the term ‘charger’ for levels 1 and 2 is misleading, as they are not technically chargers. They supply AC electricity to the EV where the on-board charger converts the AC to DC, which charges the batteries [2]. EVSE also provides important safety features for both users and charging equipment [3]. The battery management system (BMS) is another vital component in an EV charging system. It is responsible for thermal management, cell balancing, over charge and over discharge monitoring of the battery pack [4]. An EV battery pack is not made of a single battery; instead, many individual cells are combined to form a bank [4]. A single cell may only have a small safe working voltage range and it is important to ensure it stays within this range. This is particularly important with variants of lithium ion batteries commonly used in EVs. Over charge and over discharge can result in disastrous consequences including reduced battery life or total battery failure causing fires [4]. It is the job of the BMS to monitor the battery cells to 2 ensure they all stay within normal operating voltages and temperatures [4]. The BMS also balances individual cells by redistributing charge from cells of higher electric potential (voltage) to lower potential cells [4]. BMS’s use numerous techniques to manage the battery pack and Cao et al. (2008) give an excellent review of such technology [5]. The BMS is also responsible for the voltage and current requests from the charger [6] . This includes both the on board charger for levels 1 and 2 or the off board charger for level 3 EVSE. Multiple charging profiles (constant current, constant voltage etc.) are available to charge a battery; however, this is outside the scope of this paper. 2.1 Level 1 and 2 Charging As previously, mentioned, level 1 and 2 chargers provide AC electricity to the EV’s on board charger. There is communication between the EVSE and the EV to ensure the on board charger does not draw more current than the EVSE can supply, and to safely protect the user and equipment [3]. The current limit is dependent on the EVSE level and more importantly, its electrical supply. Level 1 chargers are typically inline chargers which are stored with the EV. Their compatibility with standard household electrical sockets limits the power they can deliver which consequently increases charging times. This portability, combined with their compatibly, allows their use as emergency chargers in situations where the EV battery has gone flat. In the United States, level 1 supplies correspond to a single phase supply of 12A at 110V. This allows a maximum power transfer to the EV of 1.4 kW. These chargers are slow and it can typically take 4-11 hours to fully charge an EV [2]. In countries such as New Zealand, where the grid voltage is 230V single phase, this allows a higher charging power for the same current, which reduces charging times. Assuming people’s use of their EVs does not drain the battery too much on a daily basis, a level 1 EVSE can provide adequate charging overnight. Figure 1 shows an example level 1 EVSE. Level 2 EVSE aims to improve the power output by using a dedicated ‘box’ permanently mounted on a wall or other appropriate structure. The permanently mounted box allows for a dedicated electrical supply of sufficient capacity, enabling a significantly higher power output compared to level 1. In the United States, the electrical supply to the EVSE is often spilt phase. This increases the voltage supplied to the EV to 240V, which significantly increases the power without drawing more current. Level 2 EVSE can provide between 4 and 20 kW depending on the local supply. This can reduce charging times of an EV to 1-6 hours. Both homes and dedicated charging facilities (private or public) are common locations for level 2 EVSE. Figure 2 shows an example level 2 EVSE. 3 2 Figure 1: A level 1 EVSE.1 Figure 2: A level 2 EVSE. The standardisation of connectors and protocols for levels 1 and 2 is variable across countries and manufacturers. In America, the Society of Automotive Engineers’ (SAE) J1772 standard is used to define the connector and the protocol used for levels 1 and 2 EVSE. Figure 3 shows an example SAE J1772 charge port. The connector used in Europe for levels 1 and 2 charging is the IEC 62196-2 or Mennekes connector and is shown in Figure 4. To confuse matters further, The IEC 62196 standard also defines the J1772 connector as the type 1 connector with the Mennekes connector defined as type 2. The type of connector does not relate to the EVSE level. It is important to note that both connectors use the same signalling protocol for controlling the charging process. Although both connectors are similar, the type 2 connector has two additional power pins. This is to allow a three phase AC supply to be connected directly to the EVs on board charger, further reducing charge time. Given J1772 and type 2 connectors use the same protocols, it is possible to purchase adapters to swap between connector types. Table 1 lists example manufacturers who use each of the connectors. 1 Retrieved from: http://www.roperld.com/Science/EVChargingSWVA_SWV.htm 2 Retrieved from: https://www.emotorwerks.com/store-juicebox-ev-charging-stations/202-juicebox-pro-40- smart-40-amp-evse-with-24-foot-cable 4 Figure 3: J1772 connector and charge port.3 Figure 4: Mennekes Connector. Also known as Type 2 and 62196-2.4 Table 1: Manufacturers who use J1772 and 62196-2 Manufacturer Vehicle Connector Nissan Leaf J1772 J1772 (American Models Mitsubishi i-MiEV 62196-2 (European Models) BMW i3 62196-2 Ford Focus J1772 Level 1 and level 2 EVSE with either the J1772 or type 2 connector contain signalling electronics to improve user safety and protect the infrastructure. Figure 5 contains an example of the J1772 electronic circuit schematic. One of the key safety features with the signalling electronics is the prevention of voltage being present at the connector terminals while it is not correctly mated to the EV [7].
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